Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e237fbd5ea7b
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #20296 from mcjimenez/bug1023142

Bug 1023142 - Adapt the WifiManager calls to use the correct object types (r = fcampo)

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https://hg.mozilla.org/integration/gaia-central/rev/bffd1e5c1aba
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1023142 - Adapt the WifiManager calls to use the correct object types

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https://hg.mozilla.org/integration/gaia-central/rev/e961b3b9eceb
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #20440 from arcturus/bug-1015060

Bug 1015060 - [NFC][Contact] Receiver does not receive the latest contact if the contact has been updated more than twice r=jmcf r=michalb

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https://hg.mozilla.org/integration/gaia-central/rev/a0a49a1182b7
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1015060 - [NFC][Contact] Receiver does not receive the latest contact if the contact has been updated more than twice
Bumping manifests a=b2g-bump